class_docstr: Abstract class defining required interface for var readers
docstr: Returns header 
docstr_tok: ["Returns","header"]
code: def read_header(self):
      """Returns header"""
      pass
  
imports: from __future__ import division, print_function, absolute_import
  import sys
  import operator
  from scipy._lib.six import reduce
  import numpy
  from scipy.misc import doccer
  from .None import byteordercodes
label_desc: Use image node_id 2 for calling the MatVarReader obj's underlying member method code with example usage: obj.read_header() without return types